Application
For proportional modulation of dampers in HVAC systems. The
LM24-MFT US is a non-spring return type actuator. When sup-
ply power is removed the actuator will maintain its last position.
Default/Configuration
The default parameters for 2 to 10 VDC applications of the
LM24-MFT US actuator are assigned during manufacturing. If
necessary, custom versions of the actuators can be ordered.
The parameters noted in the Technical Data table are variable.
These parameters can be changed by three means:
• Pre-set configurations from Belimo
• Custom configurations from Belimo
• Configurations set by the customer using the MFT-Handy
®
or the MFT-Actuate™ PC software application.
Operation
The LM24-MFT US actuator provides 95° of rotation and is provid-
ed with a position indicator. The actuator will synchronize it’s
mechanical stop or the damper or valves mechanical stop and
use this point for its zero position during normal control opera-
tions.
The actuator uses a brushless DC motor which is controlled by
an Application Specific Integrated Circuit (ASIC) and a micro-
processor. The microprocessor provides the intelligence to the
ASIC to provide a constant rotation rate and to know the actu-
ator’s exact position. The ASIC monitors and controls the
brushless DC motor’s rotation and provides a Digital Rotation
Sensing (DRS) function to prevent damage to the actuator in a
stall condition. The position feedback signal is generated with
out the need for mechanical feedback potentiometers using
DRS. The actuator may be stalled anywhere in its normal
rotation without the need of mechanical end switches.
The LM24-MFT US is mounted directly to control shafts up to
5/8” diameter by means of its universal clamp and anti-rotation
bracket. The actuator provides constant torque to the application
with and without power applied to the actuator. The LM24-MFT
US actuator is shipped in a Mid position, compression against
seats or gaskets for tight shut-off is accomplished manually.
Technical Data LM24-MFT US
Power supply 24 VAC, ± 20%, 50/60 Hz
24 VDC, ±10%
Power consumption running: 2 W; holding: 1 W
Transformer sizing 4 VA
(Class 2 power source)
Electrical connection 3 ft, 18 GA, UL CL2P plenum cable
Overload protection electronic throughout 0 to 95° rotation
Operating range Y* 2 to 10 VDC, 4 to 20 mA
(w/500 Ω, 1/4 W resistor) ZG-R01
Input impedance 100kΩ for 2 to 10 VDC (0.1 mA)
500Ω for 4 to 20 mA
1500Ω for PWM, Floating point and
On-Off control
Feedback output U* 2 to 10 VDC, 0.5 mA max
Torque* min 35 in-lb (4 Nm)
Direction of rotation* reversible with switch CW/CCW
CW=CW with decrease in signal
CCW=CCW with a decrease in signal
Angle of rotation* 0 to 95°, adjust with mechanical stops
Running time* 150 seconds constant
Angle of Rotation Off (Default)
Adaptation*
Override control* Min.
(Min Position) = 0%
ZS
(Mid. Position) = 50%
Max. (Max. Position) = 100%
Manual override Manual push button
Position indication clip on indicator
Humidity 5 to 95% RH, non-condensing
Ambient temperature -22 to +122° F (-30 to +50° C)
Storage temperature -40 to +176° F (-40 to +80° C)
Housing NEMA 2, IP54
Housing material UL 94-5V (flammability rating)
Noise level less than 35 dB (A)
Agency listings UL 873 listed, CE, CSA C22.2
No .24 certified
Quality standard ISO 9001
Servicing maintenance free
Weight 1.8 lbs. (0.8kg.)
* Variable when configured with MFT options
Dimensions
[All numbers in brackets are in millimeters.]
• Torque min. 35 in-lb
• Control 2 to 10 VDC (DEFAULT)
• Feedback 2 to 10 VDC (DEFAULT)
LM24-MFT US
Proportional damper actuator, non-spring return, Multi-Function Technology
®
TEMP. IND &
REG. EQUIP.
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